I actually had a dot-comma argument with my partner about a writing style issue. On the phone, he says to me "No comma between the last two elements of a list; from Strunk and White". So, I pull the book down from my shelf and it says the oppposite as in: "blue, green, red, and yellow" So, I used that style on our company web site.
But, in modern practice my partner was right. In many ways modern usage has evolved from the time of Strunk and White. Now a better guide is the AP Style Book by Associated Press.
http://www.apstylebook.com